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| PCA9629A步进马达控制解决方案 |
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| 文章来源： 更新时间：2014/8/2 9:51:00 |
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NXP公司的PCA9629A是I2C总线控制的低功耗CMOS器件,为驱动四相步进马达提供了所需的所有逻辑和控制特性.四个平衡的推挽输出可提供25 mA电流,无缝连接到外接大电流驱动器.高达1000pF负载和100 ns上升和下降时间,内置1MHz振荡器不需要外接元件,主要用于消费类家用电器或玩具,工业自动化,HVAC和建筑物环境控制系统,变速风扇和泵,零售终端,游戏机等.本文介绍了PCA9629A主要特性和优势,框图和步进马达控制框图,以及OM13285步进马达控制板Rev. 2.2电路图.
The PCA9629A is an I2C-bus controlled low-power CMOS device that provides all the logic and control required to drive a four phase stepper motor. PCA9629A is intended to be used with external high current drivers to drive the motor coils. The PCA9629A supports three stepper motor drive formats: one-phase (wave drive), two-phase, and half-step. In addition, when used as inputs, four General Purpose Input/Outputs (GPIOs) allow sensing of logic level output from optical interrupter modules and generate active LOW interrupt signal on the INT pin of PCA9629A. This is a useful feature in sensing home position of motor shaft or reference for step pulses. Upon interrupt, the PCA9629A can be programmed to automatically stop the motor, re-start motor, enable extra steps or reverse the direction of rotation of motor.
Output wave train is programmable using control registers. The control registers are programmed via the I2C-bus. Features built into the PCA9629A provide highly flexible control of stepper motor, off-load bus master/micro and significantly reduce I2C-bus traffic.
These include control of step size, number of steps per single command, number of actions from 1 to 255 or continuous rotations and direction of rotation. Re-start motor for new speed and operation without waiting for motor stop. A ramp-up on start and/or ramp-down on stop is also provided with re-enable ramp-up or ramp-down to change the ramp rate curve on the fly.
The PCA9629A is available in a 16-pin TSSOP package and is specified over the -40 degreeC to +85 degreeC industrial temperature range.
PCA9629A主要特性和优势:
Generate motor coil drive phase sequence signals with four outputs for use with external high current drivers to off-load CPU
Four balanced push-pull type outputs capable of sinking 25 mA or sourcing 25 mA for
glueless connection to external high current drivers needed to drive unipolar stepper motor coils
Up to 1000 pF loads with 100 ns rise and fall times
Built-in 1 MHz oscillator requires no external components
Stepper motor drive control logic
One-phase (wave drive), two-phase, and half-step drive format logic level outputs
Programmable step rate: 333.3 kpps to 0.3 pps with 3 % accuracy
Programmable ramp-up on start and ramp-down to stop
Programmable re-enable ramp-up or ramp-down to change ramp rate curve on the fly
Programmable re-start motor with new speed and operation while motor is still running
Programmable motor action either multiple times (1 to 255) or continuously
Programmable loop delay timer for motor reversal mode
Programmable steps with clockwise and/or counter-clockwise control
Direction control of motor shaft
Selectable active hold (last state), power on, power off or released states for motor
shaft
32-bit step counter to count output steps
Interrupt features
Active LOW open-drain interrupt output
Programmable watchdog timer with option to generate interrupt, reset device or
stop motor
Programmable motor stop interrupt
Sensor enabled drive control: linked to interrupt from GPIO pins
Programmable interrupt Mask Control for input sources
Four stepper motor drive outputs: OUT0 to OUT3
Configured to drive stepper motor outputs and capable to read back the last output
states when motor is stopped
Both output phase and state can be changed at any time
Programmable time-out timer to set all outputs to zeros when motor is stopped
Configured as general purpose outputs to drive (source/sink) loads up to 25 mA
Four general purpose I/Os: P0 to P3
Configured to sense logic level outputs from optical interrupter photo transistor
circuit
Programmable filter timer to suppress spike or noise for P0 and P1 inputs
Configured as outputs to drive (source/sink) LEDs or other loads up to 25 mA
4.5 V to 5.5 V operation
1 MHz Fast-mode Plus (Fm+) compatible I2C-bus serial interface with 30 mA
high drive capability on SDA output for driving high capacitive buses
Active LOW reset (RESET) input pin resets device to power-up default state: can be
used to recover from bus stuck condition
All Call address allows programming of more than one device at the same time with
the same parameters
16 programmable slave addresses using two address pins
40 C to +85 C operation
ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per
JESD22C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Package offered: TSSOP16
PCA9629A应用:
Amusement machines
Gaming and slot machines
Consumer home appliances or toys
Industrial automation
HVAC and building climate control systems
Robotics
Security and surveillance camera
Variable-speed fans and pumps
Vending machines
图1. PCA9629A框图
图2. PCA9629A步进马达控制框图
PCA9629A demo kit (OM13285) is designed to let customers evaluate the PCA9629A in a realistic application. The demo kit includes a stepper motor board with sensors and the stepper motor demo board with a number of pre-defined functions. The functions are executed by pressing push-button switches on the demo board.
The PCA9629A Stepper Motor Controller Demo Board is designed to let customers evaluate the PCA9629A in a realistic application. The demo board kit includes a Stepper Motor board with sensors and the Stepper Motor Demo Board with a number of pre-defined functions. The parameters used by these functions can be easily changed by changing a configuration header file. To customize the application further, the generalized driver functions used in the demo firmware can be easily modified with a free compiler tool, LPCXpresso, available at: www.lpcware.com/lpcxpresso.
图3. OM13285 PCA9629A步进马达控制板Rev. 2.2外形图
图4. OM13285 PCA9629A步进马达控制板Rev. 2.2电路图(1)
图5. OM13285 PCA9629A步进马达控制板Rev. 2.2电路图(2)
图6. OM13285 PCA9629A步进马达控制板Rev. 2.2电路图(3)
图7. OM13285 PCA9629A步进马达控制板Rev. 2.2电路图(4)
图8. OM13285 PCA9629A步进马达控制板Rev.2.2电路图(5) |
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